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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
Share-based Compensation [Abstract]  
Schedule of Stock Based Compensation Expense Table
Our stock-based compensation expense consisted of the following:
 
 
Three Months Ended 
 March 31,
 
 
2018
 
2017
 
 
(In millions)
Equity awards
 
$
13

 
$
16

Liability awards — cash-settled restricted stock units
 
(1
)
 
2

Total stock-based compensation
 
12

 
18

Capitalized in oil and gas properties
 
(2
)
 
(5
)
Net stock-based compensation expense
 
$
10

 
$
13
Restricted Stock and Restricted Stock Unit Activity Table
The following table summarizes the activity for our restricted stock and restricted stock units.
 
 
Service-Based
Shares
 
Weighted- Average Grant Date Fair Value per Share
 
Market-Based
Shares
 
Weighted- Average Grant Date Fair Value per Share
 
Total
Shares
 
 
(In thousands, except per share data)
Non-vested shares outstanding at January 1, 2018
 
2,033

 
$
32.41

 
741

 
$
38.12

 
2,774

Granted
 
207

 
26.57

 
464

(1) 
30.89

 
671

Forfeited
 
(19
)
 
35.04

 
—

 
—

 
(19
)
Vested
 
(55
)
 
29.66

 
—

 
—

 
(55
)
Non-vested shares outstanding at March 31, 2018
 
2,166

 
$
31.90

 
1,205

 
$
35.33

 
3,371


________
(1)
In February 2018, we granted approximately 464,000 restricted stock units, which based on achievement of certain criteria, could vest within a range of 0% to 200% of shares granted upon completion of the period ending December 31, 2020.
The following table provides information about cash-settled restricted stock unit activity.
 
 
Cash-Settled Restricted Stock Units
 
 
(In thousands)
Non-vested units outstanding at January 1, 2018
 
351

Granted
 
179

Forfeited
 
(2
)
Vested
 
(44
)
Non-vested units outstanding at March 31, 2018
 
484